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Texas Instruments SN74ALS541NSRE4
- Part No.:
- SN74ALS541NSRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS541NSRE4.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,335
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Product details
Overview
SN74ALS541NSRE4 from Texas Instruments is an octal buffer and line driver with 3-state outputs, designed for bus interfacing and memory address register buffering in TTL-compatible digital systems. It features true (non-inverting) data path, dual 3-state enable inputs (OE1/OE2), pnp input structure for reduced DC loading, and a data flowthrough pinout with inputs and outputs on opposite sides of the package. It operates from 4.5 V to 5.5 V and supports 0°C to 70°C industrial temperature range.
For engineers reviewing the SN74ALS541NSRE4 datasheet, SN74ALS541NSRE4 pinout, SN74ALS541NSRE4 application, or SN74ALS541NSRE4 equivalent, this device is selected for high-drive 3-state bus buffering where layout efficiency, low input current, and compatibility with legacy ALS logic families are critical - especially in memory subsystems, address/data multiplexing, and backplane interface designs.
Technical Context
The SN74ALS541NSRE4 implements a dual-NOR 3-state control gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance state. Its pnp input stage minimizes DC loading on driving sources, improving fan-out capability in dense TTL bus environments. The device belongs to the ALS (Advanced Low-Power Schottky) family, offering improved speed-power trade-offs over standard LS logic.
It delivers true (non-inverted) output logic, distinguishing it from the SN74ALS540 variant. The -1 suffix versions (e.g., SN74ALS541-1NSR) support higher IOL (48 mA), but SN74ALS541NSRE4 is the standard version rated for 24 mA low-level output current at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures robust operation across standard 5 V TTL rails with ±10% tolerance. |
| Output Drive (IOL) | 24 mA - Sufficient to drive multiple TTL loads or terminated transmission lines without external buffers. |
| Propagation Delay (tPLH/tPHL) | 4 ns to 14 ns - Enables reliable operation in systems with clock frequencies up to ~35 MHz (based on worst-case delay). |
| 3-State Enable/Disable (tPZH/tPLZ) | 5 ns to 20 ns - Fast bus turnaround time critical for bidirectional data arbitration and shared-memory access. |
| Input Voltage Thresholds (VIH/VIL) | VIH = 2.0 V min, VIL = 0.8 V max - Fully compatible with standard TTL and ALS logic voltage levels. |
| Package Type | SOP (NS) - 20-pin surface-mount package with 0.65 mm lead pitch, optimized for automated assembly and board density. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial/industrial ambient environments in embedded control and instrumentation. |
Pinout & Package
SOP (NS) package: 20-pin small-outline plastic package, 7.4 mm × 5.3 mm body, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True logic inputs accepting TTL/ALS-compatible voltage levels; pnp structure reduces input current draw. |
| 9 | GND | Ground reference for all internal circuitry and output drivers. |
| 10 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required near pin for noise suppression. |
| 11, 12 | OE1, OE2 | Active-low 3-state enables (NOR logic): either high disables all outputs to high-Z state. |
| 13–20 | Y1–Y8 Outputs | True (non-inverted), 3-state buffered outputs capable of sinking 24 mA each in low state. |
Key Features
| Feature | Design Value |
|---|---|
| Data flowthrough pinout | Inputs (A1–A8, OE1, OE2) on left side, outputs (Y1–Y8) on right side - simplifies PCB routing and minimizes trace crossovers in bus architectures. |
| pnp input structure | Reduces input current to ≤ –0.2 mA (IIL), lowering drive burden on upstream logic and enabling higher fan-out. |
| Dual 3-state enable logic | OE1 and OE2 form a 2-input NOR gate - provides flexible bus arbitration via independent or combined control signals. |
| ALS family performance | Combines LS-speed propagation (≤14 ns) with lower power consumption than standard LS, achieving ~19 mA typical ICC (outputs disabled). |
| TTL-compatible thresholds | VIH = 2.0 V min and VIL = 0.8 V max ensure interoperability with legacy 74LS, 74ALS, and microcontroller GPIOs. |
Applications
| Memory Address Buffering | Parallel Bus Interface |
|---|---|
|
Use Scenario: Buffering 8-bit address lines between microprocessor and SRAM/ROM chips in embedded controllers. IC Role / Device Role / Timing Role: Acts as unidirectional address latch driver, isolating CPU address bus from memory load capacitance and enabling clean signal edge integrity. Use Value: Prevents address skew and timing violations by providing low-propagation-delay, high-drive buffering with fast 3-state disable (<20 ns) during bus release. |
Use Scenario: Driving shared data/address buses in multi-master industrial backplanes (e.g., ISA-derived or custom parallel interconnects). IC Role / Device Role / Timing Role: Functions as a 3-state bus transceiver buffer, allowing multiple devices to share a common 8-bit bus without contention. Use Value: Dual OE inputs permit precise arbitration control; pnp inputs reduce loading on bus drivers, maintaining signal integrity across long traces. |
| Legacy System Upgrade | Industrial I/O Expansion |
|
Use Scenario: Replacing obsolete 74LS244 or 74ALS244 in maintenance-replacement boards for aging test equipment and PLC modules. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout (NS package), same truth table, and enhanced drive strength. Use Value: Maintains system timing margins while improving reliability due to ALS family's superior noise immunity and thermal stability. |
Use Scenario: Isolating and strengthening digital I/O signals from microcontrollers to relay drivers, LED arrays, or optocoupler inputs in factory automation panels. IC Role / Device Role / Timing Role: Provides level-shifted, current-boosted output staging between low-current MCU pins and higher-power external loads. Use Value: 24 mA per output eliminates need for discrete transistor stages; SOP package supports compact, automated assembly in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS541N | Same logic function and electrical specs, but in through-hole PDIP-20 package (13.97 mm width, 0.1 inch pitch). | Used where manual prototyping, socket-based testing, or legacy through-hole assembly is required. | Select SN74ALS541N for breadboarding, repair, or mixed-technology boards; SN74ALS541NSRE4 for volume SMT production. |
| SN74ALS541DWR | Identical functionality and specs, but in SOIC-20 (DW) package with 1.27 mm lead pitch and 7.5 mm body width. | Preferred when board real estate allows wider SOIC footprint and existing DW land patterns exist. | Choose SN74ALS541DWR if leveraging TI's legacy SOIC footprint; SN74ALS541NSRE4 offers finer pitch and smaller area (5.3 mm width) for high-density layouts. |
Compared with SN74ALS541N and SN74ALS541DWR, SN74ALS541NSRE4 delivers identical ALS logic behavior and timing in a space-optimized SOP package - making it optimal for modern compact industrial PCBs requiring automated assembly, while retaining full drop-in compatibility at the functional and pinout level within its package family.
Availability
SN74ALS541NSRE4 is available at Aetrix Electronics and suitable for memory subsystem design, industrial bus interfacing, and legacy logic replacement requiring stable component supply and long-term manufacturability.
Supply support for SN74ALS541NSRE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader with over 90 years of analog and logic innovation, delivering high-reliability components for industrial, automotive, and aerospace applications.
SN74ALS541NSRE4 belongs to TI's legacy ALS logic portfolio, engineered for robustness and compatibility in mission-critical digital control systems where TTL interoperability and proven field reliability are essential.
FAQ
What is the maximum output sink current for SN74ALS541NSRE4?
The SN74ALS541NSRE4 is rated for a maximum low-level output current (IOL) of 24 mA per output when VCC = 4.5 V, as specified in the recommended operating conditions. This value applies to the standard version - the -1 variant (e.g., SN74ALS541-1NSR) supports up to 48 mA under tighter VCC regulation (4.75 V–5.25 V). Exceeding 24 mA risks violating VOH/VOL specifications and thermal limits.
Is SN74ALS541NSRE4 pin-compatible with SN74ALS541N?
Yes, SN74ALS541NSRE4 and SN74ALS541N share identical pin functions and logic behavior, but differ in package: NS is 20-pin SOP (0.65 mm pitch), while N is 20-pin PDIP (0.1 inch pitch). Signal pin numbering (A1–A8, OE1/OE2, Y1–Y8, GND, VCC) matches exactly. Mechanical mounting and PCB layout are not interchangeable, but schematic symbol and netlist usage are fully compatible.
Does SN74ALS541NSRE4 support inverted output logic?
No, SN74ALS541NSRE4 provides true (non-inverting) output logic: Yn = An when enabled. For inverted outputs, use the functionally complementary part SN74ALS540NSR. Both share identical pinout, package, and 3-state control architecture - only the internal data path polarity differs.
What is the purpose of the dual OE inputs (OE1 and OE2) on SN74ALS541NSRE4?
The dual OE inputs implement a 2-input NOR gate: if either OE1 or OE2 is driven high, all eight outputs enter high-impedance state. This allows flexible bus control - e.g., OE1 tied to system address decoder, OE2 to processor bus grant signal - enabling priority-based or hierarchical bus arbitration without external logic.
Can SN74ALS541NSRE4 operate at 3.3 V supply?
No, SN74ALS541NSRE4 is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2.0 V min) and internal ALS transistor biasing require ≥4.5 V for guaranteed logic-level recognition and output drive compliance. Operating below 4.5 V may cause undefined outputs, increased propagation delay, or failure to meet VOL/VOH specs.
SN74ALS541NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS541NSRE4 FAQ
1.How can I place an order for SN74ALS541NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541NSRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ALS541NSRE4 reliable?
The price and inventory of SN74ALS541NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74ALS541NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541NSRE4?
SN74ALS541NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541NSRE4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74ALS541NSRE4?
For technical support, including SN74ALS541NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541NSRE4 requirements.
6.How does Aetrix verify that SN74ALS541NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS541NSRE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ALS541NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74ALS541NSRE4?
All SN74ALS541NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541NSRE4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ALS541NSRE4 part is unused and in its original packaging.
Return procedure for SN74ALS541NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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